Unsp fx shaft of unsp ulna, 7thN

This code describes a non-healing fracture of the main part of the ulna bone, where the skin and soft tissues were significantly damaged and exposed to the outside environment at the time of injury. The "subsequent encounter" indicates the patient is receiving follow-up care for this specific complication. The "unspecified" nature means the exact location of the fracture on the ulnar shaft is not documented.

Use this code for patients presenting for ongoing treatment of an open ulnar shaft fracture (Gustilo-Anderson type IIIA, IIIB, or IIIC) that has failed to heal properly. This applies to situations like surgical revisions, bone grafting procedures, or prolonged immobilization for established nonunion.

• Ensure documentation clearly specifies "nonunion" and the Gustilo-Anderson classification (IIIA, IIIB, or IIIC) for the initial open fracture.
• Verify the encounter is for follow-up care of the nonunion, not the initial injury or routine healing.
• Always sequence this code after any definitive treatment codes (e.g., CPT codes for bone grafting, internal fixation).